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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd638ff6222086def5c69f992d2b082fe7122f501aaccdc0ed0a7aff2e931cd1a' 
  AND token = 'ajo066bzReHREm2DuQJXOsez2zGk0ECjF+TSAyXrvyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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