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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '21a94ca332537714de5684163677c776fba170af6eefdb6bb05b1f70283e80d1' 
  AND token = 'GKOPdr1go/psoIyA3ac79DhykFRCuZT+3KYfHrwEww4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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