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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8cf009cb25e3e7a64fc6e47ff88b9d4729e060ccc3adcff3ab2a222c1539940d' 
  AND token = '8S+JVFlGkk80Uz2uVK0o61sPptAGGVhkWQ1rrGzKmk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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