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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da7bf1b51d3014f642de9a50b2c7d76de989759150d36997b44a660b02e6057a' 
  AND token = 'ijo2xEqerYbZagxUkRNyCIxo/y1wYV+DD99lIAN5nok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}