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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1660216f9be5d4bbc9aee81b28213d425f499961d31c558ef0891d79c73f8629' 
  AND token = 'ezLgdzoA3yb2EQlSrNaZvriauCWnck+lkXetjpmojN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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