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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d7dc7624497f9f5c200ed0a947745d7511cc67eb9eb742e72e0a2ab23b43e6b' 
  AND token = 'xWYqYDmf00cgyz/wLUkcNP0n1VnYzPdJtkaM8ZUB1mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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