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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2d87a3c5ad58d659084e0349f5a1c42c1acc4dee9678e3c22805b91aabb1789' 
  AND token = 'n1VOgrC/w2TnaNJNln3Brmk4FzVo63IzT1SiG5KqAos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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