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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '946571f47c11f5141415fb0149750a7c4ce0bb1d22fcb25902fc364f6698c923' 
  AND token = 'a3Vgf8oawSkKbFItvoYIkqwKQome8K0KFNkkyjZspow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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