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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42054b09e6e727b5c54aed122a8d01f0bacb1da76b676d87e0302a7d6abcc61b' 
  AND token = 'BdK4sykfN5G5bpwTREjhEIInvpRSPV5SYLBBqISmVuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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