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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4952f338e383ef89a4c2bbb293d6f4858da1c45123d4a7f011e41b28a20370d' 
  AND token = '9UdG3UAfnjHlZ77xqEcBxcZbpSCG4lwZP45EAeDIouI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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