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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee782135763501f5ef2c014825fd690eaaa09317a13d86d86d42fe4fa69f4708' 
  AND token = 'rJEeEo1neFuksmronS8omtGqr19dsdX34eUVPFjaCqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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