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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ecf90fe4c29e54a7823ff990038441790c39d959d96175fe00696a093b4953a7' 
  AND token = 'lsL+xnYDnKMxqNcqbtt4+MX8o+nu8SShwCABa7Kx6vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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