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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b645e2cb93aa7185e10aab503e0238e9de759451d1079b521f11d29e4f030bc' 
  AND token = 'btj0ik5xK9e0nyhm+fAG/r08pQ8285TmGo73jkldl5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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