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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '134232c146b007d6ab5ac152ad776bd2f3df7a8005c6d21082433d07b970572a' 
  AND token = 'GhORjnUjoKtlKMYeH549M5RUsKR2VRysRkfRR1I+CkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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