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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6b1eac9ec7393ce37ae34701276348148c074039cf4c8a9fdde52c4b6af3f00' 
  AND token = 'dFiLGFBO84g6SuuX0J8F/1i2Pi/DZIlQ0wHNXUpD2LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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