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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8882f2cf72f5bafc050bc5c5edc8ce851c4d8a89683c778f2c61c1d85cdfbdf4' 
  AND token = '/y1JWE1tZpmf8dUVccYZg+s0q7Nb96ZLm5yualD2t0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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