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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39a534774a737ff2e70f0d0b42eefe5d3fcc58ed9ded3c341346e281b492c176' 
  AND token = 'mOF3dmlaXLDrVmoZpSqRh3gzHE8HBayXOXFgRpncnAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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