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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b302b804fbfe1baec608e094895ef9f948919f445e021c313be549bf4a7b9c5' 
  AND token = 'BbT+3SRjMmHHJOo5Ep8pqFwbEOdglCG6v8TUTvh2eOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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