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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '59ee2e539d44a2ee8ae813a77e3c77687f1ced1ece0e7b2d8ece0d1e92f13041' 
  AND token = 'r5qvCmEnzPFLfkco9oVSd6WG52aPWP+PhlKxkK5BBOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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