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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '397fe54629715a7f4e65522614b350746c60474268131cb3401f223dafc781cd' 
  AND token = 'I+xYuIsP8lmFt7v+XrSRxsRS32xpmje6TpBRDLVEHMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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