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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f029183062d9534cacd494ad6bfc46f2370a6683c634db28a0ba1b341ce1c508' 
  AND token = 'CHYqN8KKSuEb0Wo3kJniIbHHio6Xp8mEaKrd3yKJ3Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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