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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7c6e963c73e87e15c036a3bd61067e1d3a347c2adb73b8a11e5aacf0e8d7671' 
  AND token = '0n26+RVS9gGPoI5Cw5GOf+TSgv4V1IhSz7i43XeW8Ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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