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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '590a7bc8100ee86d92a5d627e032fe8e0a41127225c8575b47e9e039aae27129' 
  AND token = 'JE04PqPt4CiLPY4iDhj0j5otP0QAxDsaJojOzfqgg2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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