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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67ed6fb1faad2c3d3d36db05190a8ca7aef468192fcda1905511ab8ff750162b' 
  AND token = 'sLkzgqQ3RM6yeb2LLGlmAlsXYixEMbZwM0UmprtmDiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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