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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b47791285df03ede82d46bce92f5d2bbb465cb8dc909762e2bb9e5db5baab700' 
  AND token = 'dx+i9yU1AVv7phRJ/fO7Fa1x08RAS19Sw72i6CeiFb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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