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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae393a336805cebf0e7766c563141ef28ecc407f68617dcf2dee11bb47722e84' 
  AND token = 'k+etz9IVV1RXT7Rugb6nOhhgH1gqlh6YHX86fMDWnAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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