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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4aa2b4a16c1d312102e29dc055ecc2c65af0e110b5e3b6bdde95f3c506c862bb' 
  AND token = 'eNlgwcpGg5xiZ+YGUTC0qmegGGH5NuMG3ZgkszKE+yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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