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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11823c13f43f3ad37315d8f8f5c6364dadd94c10905b37e8ae09459c5e65aaa8' 
  AND token = 'vMOwqFVNV8nD/d31rwslRXVpCpNDXe8v2CFpLDWF60M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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