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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea0314398955b12443b7f4be2df10771a8641a2bccc449d3f56df6141c4fb8e4' 
  AND token = 'Eswvh3ww+9wAQ0etr1iuU6ExhObEoM52/KPPEUs4UPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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