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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a4e1ffb9f2fa392d05795fb8adc075fe7454532017aaf5ec8c5c2150e1d9d3e' 
  AND token = 'ieogGyWBvY3crBPtf835wTmT3/do78FrKZt0bz/Jwlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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