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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fedfcef07ceba5dbc20f143b44bda5e7937e31c27faa9601bdec124854d0c2cf' 
  AND token = 'tEokS8/MyBEhuvRIzQ+RWNv84m+jlcCNdPiXYWLBJ2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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