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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e68b677485f48a358abf2af847f20352acc885aabc5dd6db6a24c5ed8e4e5ea7' 
  AND token = '4vZzOhO8fRy7YIV/XuRAaoy5vr1E+dSGQPk44aZYiu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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