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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8ae62d72f26f67d85329af8ac76886312aa3b7d4ceb5c00d0348befc102d8c2' 
  AND token = 'RKBRticFBu3ye+24UlSdBWUwEkAduUAxVwJBEfqOgdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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