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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02c8f0a70cde8e9c2bb90e7255cbd6b1f7e4985161d26e52d22260f5737fd9e6' 
  AND token = 'nQNu+qCIKZUtfqd1o91XtAwy1E4YkhY7nmNRIijQmEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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