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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '576c16408fbb9dda682512b1477c78373323a2d708f5c455ed6076a251ad8f2a' 
  AND token = 'qP1ngNhlevgrQI/pwJspA6UgCQ2PAfM8E6cPftndjjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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